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Investments in subsidiary undertakings, joint ventures and associates - Aggregate carrying amounts of the investments (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Investment funds    
Unconsolidated structured entities reported in the statement of financial position    
Aggregate carrying amount of investments in unconsolidated structured entities $ 47,701 $ 33,657
Investment funds | Equity securities and portfolio holdings in collective investment schemes    
Unconsolidated structured entities reported in the statement of financial position    
Aggregate carrying amount of investments in unconsolidated structured entities 47,701 33,657
Other structured entities    
Unconsolidated structured entities reported in the statement of financial position    
Aggregate carrying amount of investments in unconsolidated structured entities 216 285
Other structured entities | Debt securities    
Unconsolidated structured entities reported in the statement of financial position    
Aggregate carrying amount of investments in unconsolidated structured entities $ 216 $ 285